ATRIAL LATE POTENTIALS AND SPECTRAL TEMPO RAL MAPPING OF P-WAVE IN PATIENTS WITH PAROXYSMAL ATRIAL-FIBRILLATION

In order to investigate changes of parameters of temporal analysis and of spectral temporal mapping of P-wave in paroxysmal atrial fibrillat ion 110 patients with different variants of ischemic heart disease (20 patients with angina pectoris, 60 - with attacks of atrial fibrillati on and 30 - with acute myocardial infarction) were studied. Standard t echniques of detection and analysis of late atrial and ventricular pot entials were used. In addition we employed spectral temporal mapping w ith construction of two - and three-dimensional maps, automatic detect ion of local maxims of amplitudes of frequencies in analysed ranges, a nd graphical reconstruction of distribution of detected peaks of ampli tudes by frequency and time, Two variants of changes of amplitudal val ues to total spectral density of filtered P-wave and its last 20 ms we re distinguished in patients with paroxysm al atrial fibrillation. Som e special features of temporal distribution of detected peaks of frequ encies were found on averaged spectral temporal maps: in control group predominant region in which extremums were found was located in the t emporal range between 40 and 50 ms while patients with paroxysmal atri al fibrillation were characterised by fragmentation and prevalence of extremums in high frequency band.